/* imail.c - Handles Intelligent Mail (aka OneCode) for USPS */

/*
    libzint - the open source barcode library
    Copyright (C) 2008-2016 Robin Stuart <rstuart114@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
    3. Neither the name of the project nor the names of its contributors
       may be used to endorse or promote products derived from this software
       without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.
 */

/*  The function "USPS_MSB_Math_CRC11GenerateFrameCheckSequence"
    is Copyright (C) 2006 United States Postal Service */

static const short int BCD[40] = {
    0, 0, 0, 0,
    1, 0, 0, 0,
    0, 1, 0, 0,
    1, 1, 0, 0,
    0, 0, 1, 0,
    1, 0, 1, 0,
    0, 1, 1, 0,
    1, 1, 1, 0,
    0, 0, 0, 1,
    1, 0, 0, 1
};

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "common.h"
#include "large.h"

#define SODIUM	"0123456789-"

/* The following lookup tables were generated using the code in Appendix C */

static const unsigned short AppxD_I[1287] = {
    /* Appendix D Table 1 - 5 of 13 characters */
    0x001F, 0x1F00, 0x002F, 0x1E80, 0x0037, 0x1D80, 0x003B, 0x1B80, 0x003D, 0x1780,
    0x003E, 0x0F80, 0x004F, 0x1E40, 0x0057, 0x1D40, 0x005B, 0x1B40, 0x005D, 0x1740,
    0x005E, 0x0F40, 0x0067, 0x1CC0, 0x006B, 0x1AC0, 0x006D, 0x16C0, 0x006E, 0x0EC0,
    0x0073, 0x19C0, 0x0075, 0x15C0, 0x0076, 0x0DC0, 0x0079, 0x13C0, 0x007A, 0x0BC0,
    0x007C, 0x07C0, 0x008F, 0x1E20, 0x0097, 0x1D20, 0x009B, 0x1B20, 0x009D, 0x1720,
    0x009E, 0x0F20, 0x00A7, 0x1CA0, 0x00AB, 0x1AA0, 0x00AD, 0x16A0, 0x00AE, 0x0EA0,
    0x00B3, 0x19A0, 0x00B5, 0x15A0, 0x00B6, 0x0DA0, 0x00B9, 0x13A0, 0x00BA, 0x0BA0,
    0x00BC, 0x07A0, 0x00C7, 0x1C60, 0x00CB, 0x1A60, 0x00CD, 0x1660, 0x00CE, 0x0E60,
    0x00D3, 0x1960, 0x00D5, 0x1560, 0x00D6, 0x0D60, 0x00D9, 0x1360, 0x00DA, 0x0B60,
    0x00DC, 0x0760, 0x00E3, 0x18E0, 0x00E5, 0x14E0, 0x00E6, 0x0CE0, 0x00E9, 0x12E0,
    0x00EA, 0x0AE0, 0x00EC, 0x06E0, 0x00F1, 0x11E0, 0x00F2, 0x09E0, 0x00F4, 0x05E0,
    0x00F8, 0x03E0, 0x010F, 0x1E10, 0x0117, 0x1D10, 0x011B, 0x1B10, 0x011D, 0x1710,
    0x011E, 0x0F10, 0x0127, 0x1C90, 0x012B, 0x1A90, 0x012D, 0x1690, 0x012E, 0x0E90,
    0x0133, 0x1990, 0x0135, 0x1590, 0x0136, 0x0D90, 0x0139, 0x1390, 0x013A, 0x0B90,
    0x013C, 0x0790, 0x0147, 0x1C50, 0x014B, 0x1A50, 0x014D, 0x1650, 0x014E, 0x0E50,
    0x0153, 0x1950, 0x0155, 0x1550, 0x0156, 0x0D50, 0x0159, 0x1350, 0x015A, 0x0B50,
    0x015C, 0x0750, 0x0163, 0x18D0, 0x0165, 0x14D0, 0x0166, 0x0CD0, 0x0169, 0x12D0,
    0x016A, 0x0AD0, 0x016C, 0x06D0, 0x0171, 0x11D0, 0x0172, 0x09D0, 0x0174, 0x05D0,
    0x0178, 0x03D0, 0x0187, 0x1C30, 0x018B, 0x1A30, 0x018D, 0x1630, 0x018E, 0x0E30,
    0x0193, 0x1930, 0x0195, 0x1530, 0x0196, 0x0D30, 0x0199, 0x1330, 0x019A, 0x0B30,
    0x019C, 0x0730, 0x01A3, 0x18B0, 0x01A5, 0x14B0, 0x01A6, 0x0CB0, 0x01A9, 0x12B0,
    0x01AA, 0x0AB0, 0x01AC, 0x06B0, 0x01B1, 0x11B0, 0x01B2, 0x09B0, 0x01B4, 0x05B0,
    0x01B8, 0x03B0, 0x01C3, 0x1870, 0x01C5, 0x1470, 0x01C6, 0x0C70, 0x01C9, 0x1270,
    0x01CA, 0x0A70, 0x01CC, 0x0670, 0x01D1, 0x1170, 0x01D2, 0x0970, 0x01D4, 0x0570,
    0x01D8, 0x0370, 0x01E1, 0x10F0, 0x01E2, 0x08F0, 0x01E4, 0x04F0, 0x01E8, 0x02F0,
    0x020F, 0x1E08, 0x0217, 0x1D08, 0x021B, 0x1B08, 0x021D, 0x1708, 0x021E, 0x0F08,
    0x0227, 0x1C88, 0x022B, 0x1A88, 0x022D, 0x1688, 0x022E, 0x0E88, 0x0233, 0x1988,
    0x0235, 0x1588, 0x0236, 0x0D88, 0x0239, 0x1388, 0x023A, 0x0B88, 0x023C, 0x0788,
    0x0247, 0x1C48, 0x024B, 0x1A48, 0x024D, 0x1648, 0x024E, 0x0E48, 0x0253, 0x1948,
    0x0255, 0x1548, 0x0256, 0x0D48, 0x0259, 0x1348, 0x025A, 0x0B48, 0x025C, 0x0748,
    0x0263, 0x18C8, 0x0265, 0x14C8, 0x0266, 0x0CC8, 0x0269, 0x12C8, 0x026A, 0x0AC8,
    0x026C, 0x06C8, 0x0271, 0x11C8, 0x0272, 0x09C8, 0x0274, 0x05C8, 0x0278, 0x03C8,
    0x0287, 0x1C28, 0x028B, 0x1A28, 0x028D, 0x1628, 0x028E, 0x0E28, 0x0293, 0x1928,
    0x0295, 0x1528, 0x0296, 0x0D28, 0x0299, 0x1328, 0x029A, 0x0B28, 0x029C, 0x0728,
    0x02A3, 0x18A8, 0x02A5, 0x14A8, 0x02A6, 0x0CA8, 0x02A9, 0x12A8, 0x02AA, 0x0AA8,
    0x02AC, 0x06A8, 0x02B1, 0x11A8, 0x02B2, 0x09A8, 0x02B4, 0x05A8, 0x02B8, 0x03A8,
    0x02C3, 0x1868, 0x02C5, 0x1468, 0x02C6, 0x0C68, 0x02C9, 0x1268, 0x02CA, 0x0A68,
    0x02CC, 0x0668, 0x02D1, 0x1168, 0x02D2, 0x0968, 0x02D4, 0x0568, 0x02D8, 0x0368,
    0x02E1, 0x10E8, 0x02E2, 0x08E8, 0x02E4, 0x04E8, 0x0307, 0x1C18, 0x030B, 0x1A18,
    0x030D, 0x1618, 0x030E, 0x0E18, 0x0313, 0x1918, 0x0315, 0x1518, 0x0316, 0x0D18,
    0x0319, 0x1318, 0x031A, 0x0B18, 0x031C, 0x0718, 0x0323, 0x1898, 0x0325, 0x1498,
    0x0326, 0x0C98, 0x0329, 0x1298, 0x032A, 0x0A98, 0x032C, 0x0698, 0x0331, 0x1198,
    0x0332, 0x0998, 0x0334, 0x0598, 0x0338, 0x0398, 0x0343, 0x1858, 0x0345, 0x1458,
    0x0346, 0x0C58, 0x0349, 0x1258, 0x034A, 0x0A58, 0x034C, 0x0658, 0x0351, 0x1158,
    0x0352, 0x0958, 0x0354, 0x0558, 0x0361, 0x10D8, 0x0362, 0x08D8, 0x0364, 0x04D8,
    0x0383, 0x1838, 0x0385, 0x1438, 0x0386, 0x0C38, 0x0389, 0x1238, 0x038A, 0x0A38,
    0x038C, 0x0638, 0x0391, 0x1138, 0x0392, 0x0938, 0x0394, 0x0538, 0x03A1, 0x10B8,
    0x03A2, 0x08B8, 0x03A4, 0x04B8, 0x03C1, 0x1078, 0x03C2, 0x0878, 0x03C4, 0x0478,
    0x040F, 0x1E04, 0x0417, 0x1D04, 0x041B, 0x1B04, 0x041D, 0x1704, 0x041E, 0x0F04,
    0x0427, 0x1C84, 0x042B, 0x1A84, 0x042D, 0x1684, 0x042E, 0x0E84, 0x0433, 0x1984,
    0x0435, 0x1584, 0x0436, 0x0D84, 0x0439, 0x1384, 0x043A, 0x0B84, 0x043C, 0x0784,
    0x0447, 0x1C44, 0x044B, 0x1A44, 0x044D, 0x1644, 0x044E, 0x0E44, 0x0453, 0x1944,
    0x0455, 0x1544, 0x0456, 0x0D44, 0x0459, 0x1344, 0x045A, 0x0B44, 0x045C, 0x0744,
    0x0463, 0x18C4, 0x0465, 0x14C4, 0x0466, 0x0CC4, 0x0469, 0x12C4, 0x046A, 0x0AC4,
    0x046C, 0x06C4, 0x0471, 0x11C4, 0x0472, 0x09C4, 0x0474, 0x05C4, 0x0487, 0x1C24,
    0x048B, 0x1A24, 0x048D, 0x1624, 0x048E, 0x0E24, 0x0493, 0x1924, 0x0495, 0x1524,
    0x0496, 0x0D24, 0x0499, 0x1324, 0x049A, 0x0B24, 0x049C, 0x0724, 0x04A3, 0x18A4,
    0x04A5, 0x14A4, 0x04A6, 0x0CA4, 0x04A9, 0x12A4, 0x04AA, 0x0AA4, 0x04AC, 0x06A4,
    0x04B1, 0x11A4, 0x04B2, 0x09A4, 0x04B4, 0x05A4, 0x04C3, 0x1864, 0x04C5, 0x1464,
    0x04C6, 0x0C64, 0x04C9, 0x1264, 0x04CA, 0x0A64, 0x04CC, 0x0664, 0x04D1, 0x1164,
    0x04D2, 0x0964, 0x04D4, 0x0564, 0x04E1, 0x10E4, 0x04E2, 0x08E4, 0x0507, 0x1C14,
    0x050B, 0x1A14, 0x050D, 0x1614, 0x050E, 0x0E14, 0x0513, 0x1914, 0x0515, 0x1514,
    0x0516, 0x0D14, 0x0519, 0x1314, 0x051A, 0x0B14, 0x051C, 0x0714, 0x0523, 0x1894,
    0x0525, 0x1494, 0x0526, 0x0C94, 0x0529, 0x1294, 0x052A, 0x0A94, 0x052C, 0x0694,
    0x0531, 0x1194, 0x0532, 0x0994, 0x0534, 0x0594, 0x0543, 0x1854, 0x0545, 0x1454,
    0x0546, 0x0C54, 0x0549, 0x1254, 0x054A, 0x0A54, 0x054C, 0x0654, 0x0551, 0x1154,
    0x0552, 0x0954, 0x0561, 0x10D4, 0x0562, 0x08D4, 0x0583, 0x1834, 0x0585, 0x1434,
    0x0586, 0x0C34, 0x0589, 0x1234, 0x058A, 0x0A34, 0x058C, 0x0634, 0x0591, 0x1134,
    0x0592, 0x0934, 0x05A1, 0x10B4, 0x05A2, 0x08B4, 0x05C1, 0x1074, 0x05C2, 0x0874,
    0x0607, 0x1C0C, 0x060B, 0x1A0C, 0x060D, 0x160C, 0x060E, 0x0E0C, 0x0613, 0x190C,
    0x0615, 0x150C, 0x0616, 0x0D0C, 0x0619, 0x130C, 0x061A, 0x0B0C, 0x061C, 0x070C,
    0x0623, 0x188C, 0x0625, 0x148C, 0x0626, 0x0C8C, 0x0629, 0x128C, 0x062A, 0x0A8C,
    0x062C, 0x068C, 0x0631, 0x118C, 0x0632, 0x098C, 0x0643, 0x184C, 0x0645, 0x144C,
    0x0646, 0x0C4C, 0x0649, 0x124C, 0x064A, 0x0A4C, 0x0651, 0x114C, 0x0652, 0x094C,
    0x0661, 0x10CC, 0x0662, 0x08CC, 0x0683, 0x182C, 0x0685, 0x142C, 0x0686, 0x0C2C,
    0x0689, 0x122C, 0x068A, 0x0A2C, 0x0691, 0x112C, 0x0692, 0x092C, 0x06A1, 0x10AC,
    0x06A2, 0x08AC, 0x06C1, 0x106C, 0x06C2, 0x086C, 0x0703, 0x181C, 0x0705, 0x141C,
    0x0706, 0x0C1C, 0x0709, 0x121C, 0x070A, 0x0A1C, 0x0711, 0x111C, 0x0712, 0x091C,
    0x0721, 0x109C, 0x0722, 0x089C, 0x0741, 0x105C, 0x0742, 0x085C, 0x0781, 0x103C,
    0x0782, 0x083C, 0x080F, 0x1E02, 0x0817, 0x1D02, 0x081B, 0x1B02, 0x081D, 0x1702,
    0x081E, 0x0F02, 0x0827, 0x1C82, 0x082B, 0x1A82, 0x082D, 0x1682, 0x082E, 0x0E82,
    0x0833, 0x1982, 0x0835, 0x1582, 0x0836, 0x0D82, 0x0839, 0x1382, 0x083A, 0x0B82,
    0x0847, 0x1C42, 0x084B, 0x1A42, 0x084D, 0x1642, 0x084E, 0x0E42, 0x0853, 0x1942,
    0x0855, 0x1542, 0x0856, 0x0D42, 0x0859, 0x1342, 0x085A, 0x0B42, 0x0863, 0x18C2,
    0x0865, 0x14C2, 0x0866, 0x0CC2, 0x0869, 0x12C2, 0x086A, 0x0AC2, 0x0871, 0x11C2,
    0x0872, 0x09C2, 0x0887, 0x1C22, 0x088B, 0x1A22, 0x088D, 0x1622, 0x088E, 0x0E22,
    0x0893, 0x1922, 0x0895, 0x1522, 0x0896, 0x0D22, 0x0899, 0x1322, 0x089A, 0x0B22,
    0x08A3, 0x18A2, 0x08A5, 0x14A2, 0x08A6, 0x0CA2, 0x08A9, 0x12A2, 0x08AA, 0x0AA2,
    0x08B1, 0x11A2, 0x08B2, 0x09A2, 0x08C3, 0x1862, 0x08C5, 0x1462, 0x08C6, 0x0C62,
    0x08C9, 0x1262, 0x08CA, 0x0A62, 0x08D1, 0x1162, 0x08D2, 0x0962, 0x08E1, 0x10E2,
    0x0907, 0x1C12, 0x090B, 0x1A12, 0x090D, 0x1612, 0x090E, 0x0E12, 0x0913, 0x1912,
    0x0915, 0x1512, 0x0916, 0x0D12, 0x0919, 0x1312, 0x091A, 0x0B12, 0x0923, 0x1892,
    0x0925, 0x1492, 0x0926, 0x0C92, 0x0929, 0x1292, 0x092A, 0x0A92, 0x0931, 0x1192,
    0x0932, 0x0992, 0x0943, 0x1852, 0x0945, 0x1452, 0x0946, 0x0C52, 0x0949, 0x1252,
    0x094A, 0x0A52, 0x0951, 0x1152, 0x0961, 0x10D2, 0x0983, 0x1832, 0x0985, 0x1432,
    0x0986, 0x0C32, 0x0989, 0x1232, 0x098A, 0x0A32, 0x0991, 0x1132, 0x09A1, 0x10B2,
    0x09C1, 0x1072, 0x0A07, 0x1C0A, 0x0A0B, 0x1A0A, 0x0A0D, 0x160A, 0x0A0E, 0x0E0A,
    0x0A13, 0x190A, 0x0A15, 0x150A, 0x0A16, 0x0D0A, 0x0A19, 0x130A, 0x0A1A, 0x0B0A,
    0x0A23, 0x188A, 0x0A25, 0x148A, 0x0A26, 0x0C8A, 0x0A29, 0x128A, 0x0A2A, 0x0A8A,
    0x0A31, 0x118A, 0x0A43, 0x184A, 0x0A45, 0x144A, 0x0A46, 0x0C4A, 0x0A49, 0x124A,
    0x0A51, 0x114A, 0x0A61, 0x10CA, 0x0A83, 0x182A, 0x0A85, 0x142A, 0x0A86, 0x0C2A,
    0x0A89, 0x122A, 0x0A91, 0x112A, 0x0AA1, 0x10AA, 0x0AC1, 0x106A, 0x0B03, 0x181A,
    0x0B05, 0x141A, 0x0B06, 0x0C1A, 0x0B09, 0x121A, 0x0B11, 0x111A, 0x0B21, 0x109A,
    0x0B41, 0x105A, 0x0B81, 0x103A, 0x0C07, 0x1C06, 0x0C0B, 0x1A06, 0x0C0D, 0x1606,
    0x0C0E, 0x0E06, 0x0C13, 0x1906, 0x0C15, 0x1506, 0x0C16, 0x0D06, 0x0C19, 0x1306,
    0x0C23, 0x1886, 0x0C25, 0x1486, 0x0C26, 0x0C86, 0x0C29, 0x1286, 0x0C31, 0x1186,
    0x0C43, 0x1846, 0x0C45, 0x1446, 0x0C49, 0x1246, 0x0C51, 0x1146, 0x0C61, 0x10C6,
    0x0C83, 0x1826, 0x0C85, 0x1426, 0x0C89, 0x1226, 0x0C91, 0x1126, 0x0CA1, 0x10A6,
    0x0CC1, 0x1066, 0x0D03, 0x1816, 0x0D05, 0x1416, 0x0D09, 0x1216, 0x0D11, 0x1116,
    0x0D21, 0x1096, 0x0D41, 0x1056, 0x0D81, 0x1036, 0x0E03, 0x180E, 0x0E05, 0x140E,
    0x0E09, 0x120E, 0x0E11, 0x110E, 0x0E21, 0x108E, 0x0E41, 0x104E, 0x0E81, 0x102E,
    0x0F01, 0x101E, 0x100F, 0x1E01, 0x1017, 0x1D01, 0x101B, 0x1B01, 0x101D, 0x1701,
    0x1027, 0x1C81, 0x102B, 0x1A81, 0x102D, 0x1681, 0x1033, 0x1981, 0x1035, 0x1581,
    0x1039, 0x1381, 0x1047, 0x1C41, 0x104B, 0x1A41, 0x104D, 0x1641, 0x1053, 0x1941,
    0x1055, 0x1541, 0x1059, 0x1341, 0x1063, 0x18C1, 0x1065, 0x14C1, 0x1069, 0x12C1,
    0x1071, 0x11C1, 0x1087, 0x1C21, 0x108B, 0x1A21, 0x108D, 0x1621, 0x1093, 0x1921,
    0x1095, 0x1521, 0x1099, 0x1321, 0x10A3, 0x18A1, 0x10A5, 0x14A1, 0x10A9, 0x12A1,
    0x10B1, 0x11A1, 0x10C3, 0x1861, 0x10C5, 0x1461, 0x10C9, 0x1261, 0x10D1, 0x1161,
    0x1107, 0x1C11, 0x110B, 0x1A11, 0x110D, 0x1611, 0x1113, 0x1911, 0x1115, 0x1511,
    0x1119, 0x1311, 0x1123, 0x1891, 0x1125, 0x1491, 0x1129, 0x1291, 0x1131, 0x1191,
    0x1143, 0x1851, 0x1145, 0x1451, 0x1149, 0x1251, 0x1183, 0x1831, 0x1185, 0x1431,
    0x1189, 0x1231, 0x1207, 0x1C09, 0x120B, 0x1A09, 0x120D, 0x1609, 0x1213, 0x1909,
    0x1215, 0x1509, 0x1219, 0x1309, 0x1223, 0x1889, 0x1225, 0x1489, 0x1229, 0x1289,
    0x1243, 0x1849, 0x1245, 0x1449, 0x1283, 0x1829, 0x1285, 0x1429, 0x1303, 0x1819,
    0x1305, 0x1419, 0x1407, 0x1C05, 0x140B, 0x1A05, 0x140D, 0x1605, 0x1413, 0x1905,
    0x1415, 0x1505, 0x1423, 0x1885, 0x1425, 0x1485, 0x1443, 0x1845, 0x1483, 0x1825,
    0x1503, 0x1815, 0x1603, 0x180D, 0x1807, 0x1C03, 0x180B, 0x1A03, 0x1813, 0x1903,
    0x1823, 0x1883, 0x1843, 0x1445, 0x1249, 0x1151, 0x10E1, 0x0C46, 0x0A4A, 0x0952,
    0x08E2, 0x064C, 0x0554, 0x04E4, 0x0358, 0x02E8, 0x01F0
};

static const unsigned short AppxD_II[78] = {
    /* Appendix D Table II - 2 of 13 characters */
    0x0003, 0x1800, 0x0005, 0x1400, 0x0006, 0x0C00, 0x0009, 0x1200, 0x000A, 0x0A00,
    0x000C, 0x0600, 0x0011, 0x1100, 0x0012, 0x0900, 0x0014, 0x0500, 0x0018, 0x0300,
    0x0021, 0x1080, 0x0022, 0x0880, 0x0024, 0x0480, 0x0028, 0x0280, 0x0030, 0x0180,
    0x0041, 0x1040, 0x0042, 0x0840, 0x0044, 0x0440, 0x0048, 0x0240, 0x0050, 0x0140,
    0x0060, 0x00C0, 0x0081, 0x1020, 0x0082, 0x0820, 0x0084, 0x0420, 0x0088, 0x0220,
    0x0090, 0x0120, 0x0101, 0x1010, 0x0102, 0x0810, 0x0104, 0x0410, 0x0108, 0x0210,
    0x0201, 0x1008, 0x0202, 0x0808, 0x0204, 0x0408, 0x0401, 0x1004, 0x0402, 0x0804,
    0x0801, 0x1002, 0x1001, 0x0802, 0x0404, 0x0208, 0x0110, 0x00A0
};

static const int AppxD_IV[130] = {
    /* Appendix D Table IV - Bar-to-Character Mapping (reverse lookup) */
    67, 6, 78, 16, 86, 95, 34, 40, 45, 113, 117, 121, 62, 87, 18, 104, 41, 76, 57, 119, 115, 72, 97,
    2, 127, 26, 105, 35, 122, 52, 114, 7, 24, 82, 68, 63, 94, 44, 77, 112, 70, 100, 39, 30, 107,
    15, 125, 85, 10, 65, 54, 88, 20, 106, 46, 66, 8, 116, 29, 61, 99, 80, 90, 37, 123, 51, 25, 84,
    129, 56, 4, 109, 96, 28, 36, 47, 11, 71, 33, 102, 21, 9, 17, 49, 124, 79, 64, 91, 42, 69, 53,
    60, 14, 1, 27, 103, 126, 75, 89, 50, 120, 19, 32, 110, 92, 111, 130, 59, 31, 12, 81, 43, 55,
    5, 74, 22, 101, 128, 58, 118, 48, 108, 38, 98, 93, 23, 83, 13, 73, 3
};

/***************************************************************************
 ** USPS_MSB_Math_CRC11GenerateFrameCheckSequence
 **
 ** Inputs:
 **   ByteAttayPtr is the address of a 13 byte array holding 102 bytes which
 **   are right justified - ie: the leftmost 2 bits of the first byte do not
 **   hold data and must be set to zero.
 **
 ** Outputs:
 **   return unsigned short - 11 bit Frame Check Sequence (right justified)
 ***************************************************************************/
extern unsigned short USPS_MSB_Math_CRC11GenerateFrameCheckSequence(unsigned char *ByteArrayPtr) {
    unsigned short GeneratorPolynomial = 0x0F35;
    unsigned short FrameCheckSequence = 0x07FF;
    unsigned short Data;
    int ByteIndex, Bit;

    /* Do most significant byte skipping the 2 most significant bits */
    Data = *ByteArrayPtr << 5;
    ByteArrayPtr++;
    for (Bit = 2; Bit < 8; Bit++) {
        if ((FrameCheckSequence ^ Data) & 0x400)
            FrameCheckSequence = (FrameCheckSequence << 1) ^ GeneratorPolynomial;
        else
            FrameCheckSequence = (FrameCheckSequence << 1);
        FrameCheckSequence &= 0x7FF;
        Data <<= 1;
    }
    /* Do rest of the bytes */
    for (ByteIndex = 1; ByteIndex < 13; ByteIndex++) {
        Data = *ByteArrayPtr << 3;
        ByteArrayPtr++;
        for (Bit = 0; Bit < 8; Bit++) {
            if ((FrameCheckSequence ^ Data) & 0x0400) {
                FrameCheckSequence = (FrameCheckSequence << 1) ^ GeneratorPolynomial;
            } else {
                FrameCheckSequence = (FrameCheckSequence << 1);
            }
            FrameCheckSequence &= 0x7FF;
            Data <<= 1;
        }
    }
    return FrameCheckSequence;
}

int imail(struct zint_symbol *symbol, unsigned char source[], int length) {
    char data_pattern[200];
    int error_number;
    int i, j, read;
    char zip[35], tracker[35], zip_adder[11], temp[2];
    short int accum[112], x_reg[112], y_reg[112];
    unsigned char byte_array[13];
    unsigned short usps_crc;
    int codeword[10];
    unsigned short characters[10];
    short int bar_map[130];

    error_number = 0;

    if (length > 32) {
        strcpy(symbol->errtxt, "Input too long (D50)");
        return ZINT_ERROR_TOO_LONG;
    }
    error_number = is_sane(SODIUM, source, length);
    if (error_number == ZINT_ERROR_INVALID_DATA) {
        strcpy(symbol->errtxt, "Invalid characters in data (D51)");
        return error_number;
    }

    strcpy(zip, "");
    strcpy(tracker, "");

    /* separate the tracking code from the routing code */

    read = 0;
    j = 0;
    for (i = 0; i < length; i++) {
        if (source[i] == '-') {
            tracker[read] = '\0';
            j = 1;
            read = 0;
        } else {
            if (j == 0) {
                /* reading tracker */
                tracker[read] = source[i];
                read++;
            } else {
                /* reading zip code */
                zip[read] = source[i];
                read++;
            }
        }
    }
    if (j == 0) {
        tracker[read] = '\0';
    } else {
        zip[read] = '\0';
    }

    if (strlen(tracker) != 20) {
        strcpy(symbol->errtxt, "Invalid length tracking code (D52)");
        return ZINT_ERROR_INVALID_DATA;
    }
    if (strlen(zip) > 11) {
        strcpy(symbol->errtxt, "Invalid ZIP code (D53)");
        return ZINT_ERROR_INVALID_DATA;
    }

    /* *** Step 1 - Conversion of Data Fields into Binary Data *** */

    /* Routing code first */

    for (i = 0; i < 112; i++) {
        accum[i] = 0;
    }

    for (read = 0; read < strlen(zip); read++) {

        for (i = 0; i < 112; i++) {
            x_reg[i] = accum[i];
        }

        for (i = 0; i < 9; i++) {
            binary_add(accum, x_reg);
        }

        x_reg[0] = BCD[ctoi(zip[read]) * 4];
        x_reg[1] = BCD[(ctoi(zip[read]) * 4) + 1];
        x_reg[2] = BCD[(ctoi(zip[read]) * 4) + 2];
        x_reg[3] = BCD[(ctoi(zip[read]) * 4) + 3];
        for (i = 4; i < 112; i++) {
            x_reg[i] = 0;
        }

        binary_add(accum, x_reg);
    }

    /* add weight to routing code */

    for (i = 0; i < 112; i++) {
        x_reg[i] = accum[i];
    }

    if (strlen(zip) > 9) {
        strcpy(zip_adder, "1000100001");
    } else {
        if (strlen(zip) > 5) {
            strcpy(zip_adder, "100001");
        } else {
            if (strlen(zip) > 0) {
                strcpy(zip_adder, "1");
            } else {
                strcpy(zip_adder, "0");
            }
        }
    }

    for (i = 0; i < 112; i++) {
        accum[i] = 0;
    }

    for (read = 0; read < strlen(zip_adder); read++) {

        for (i = 0; i < 112; i++) {
            y_reg[i] = accum[i];
        }

        for (i = 0; i < 9; i++) {
            binary_add(accum, y_reg);
        }

        y_reg[0] = BCD[ctoi(zip_adder[read]) * 4];
        y_reg[1] = BCD[(ctoi(zip_adder[read]) * 4) + 1];
        y_reg[2] = BCD[(ctoi(zip_adder[read]) * 4) + 2];
        y_reg[3] = BCD[(ctoi(zip_adder[read]) * 4) + 3];
        for (i = 4; i < 112; i++) {
            y_reg[i] = 0;
        }

        binary_add(accum, y_reg);
    }

    binary_add(accum, x_reg);

    /* tracking code */

    /* multiply by 10 */
    for (i = 0; i < 112; i++) {
        y_reg[i] = accum[i];
    }

    for (i = 0; i < 9; i++) {
        binary_add(accum, y_reg);
    }

    /* add first digit of tracker */
    y_reg[0] = BCD[ctoi(tracker[0]) * 4];
    y_reg[1] = BCD[(ctoi(tracker[0]) * 4) + 1];
    y_reg[2] = BCD[(ctoi(tracker[0]) * 4) + 2];
    y_reg[3] = BCD[(ctoi(tracker[0]) * 4) + 3];
    for (i = 4; i < 112; i++) {
        y_reg[i] = 0;
    }

    binary_add(accum, y_reg);

    /* multiply by 5 */
    for (i = 0; i < 112; i++) {
        y_reg[i] = accum[i];
    }

    for (i = 0; i < 4; i++) {
        binary_add(accum, y_reg);
    }

    /* add second digit */
    y_reg[0] = BCD[ctoi(tracker[1]) * 4];
    y_reg[1] = BCD[(ctoi(tracker[1]) * 4) + 1];
    y_reg[2] = BCD[(ctoi(tracker[1]) * 4) + 2];
    y_reg[3] = BCD[(ctoi(tracker[1]) * 4) + 3];
    for (i = 4; i < 112; i++) {
        y_reg[i] = 0;
    }

    binary_add(accum, y_reg);

    /* and then the rest */

    for (read = 2; read < strlen(tracker); read++) {

        for (i = 0; i < 112; i++) {
            y_reg[i] = accum[i];
        }

        for (i = 0; i < 9; i++) {
            binary_add(accum, y_reg);
        }

        y_reg[0] = BCD[ctoi(tracker[read]) * 4];
        y_reg[1] = BCD[(ctoi(tracker[read]) * 4) + 1];
        y_reg[2] = BCD[(ctoi(tracker[read]) * 4) + 2];
        y_reg[3] = BCD[(ctoi(tracker[read]) * 4) + 3];
        for (i = 4; i < 112; i++) {
            y_reg[i] = 0;
        }

        binary_add(accum, y_reg);
    }

    /* *** Step 2 - Generation of 11-bit CRC on Binary Data *** */

    accum[103] = 0;
    accum[102] = 0;

    memset(byte_array, 0, 13);
    for (j = 0; j < 13; j++) {
        i = 96 - (8 * j);
        byte_array[j] = 0;
        byte_array[j] += accum[i];
        byte_array[j] += 2 * accum[i + 1];
        byte_array[j] += 4 * accum[i + 2];
        byte_array[j] += 8 * accum[i + 3];
        byte_array[j] += 16 * accum[i + 4];
        byte_array[j] += 32 * accum[i + 5];
        byte_array[j] += 64 * accum[i + 6];
        byte_array[j] += 128 * accum[i + 7];
    }

    usps_crc = USPS_MSB_Math_CRC11GenerateFrameCheckSequence(byte_array);

    /* *** Step 3 - Conversion from Binary Data to Codewords *** */

    /* start with codeword J which is base 636 */
    for (i = 0; i < 112; i++) {
        x_reg[i] = 0;
        y_reg[i] = 0;
    }

    x_reg[101] = 1;
    x_reg[98] = 1;
    x_reg[97] = 1;
    x_reg[96] = 1;
    x_reg[95] = 1;
    x_reg[94] = 1;

    for (i = 92; i >= 0; i--) {
        y_reg[i] = islarger(accum, x_reg);
        if (y_reg[i] == 1) {
            binary_subtract(accum, x_reg);
        }
        shiftdown(x_reg);
    }

    codeword[9] = (accum[9] * 512) + (accum[8] * 256) + (accum[7] * 128) + (accum[6] * 64) +
            (accum[5] * 32) + (accum[4] * 16) + (accum[3] * 8) + (accum[2] * 4) +
            (accum[1] * 2) + accum[0];

    /* then codewords I to B with base 1365 */

    for (j = 8; j > 0; j--) {
        for (i = 0; i < 112; i++) {
            accum[i] = y_reg[i];
            y_reg[i] = 0;
            x_reg[i] = 0;
        }
        x_reg[101] = 1;
        x_reg[99] = 1;
        x_reg[97] = 1;
        x_reg[95] = 1;
        x_reg[93] = 1;
        x_reg[91] = 1;
        for (i = 91; i >= 0; i--) {
            y_reg[i] = islarger(accum, x_reg);
            if (y_reg[i] == 1) {
                binary_subtract(accum, x_reg);
            }
            shiftdown(x_reg);
        }

        codeword[j] = (accum[10] * 1024) + (accum[9] * 512) + (accum[8] * 256) +
                (accum[7] * 128) + (accum[6] * 64) + (accum[5] * 32) +
                (accum[4] * 16) + (accum[3] * 8) + (accum[2] * 4) +
                (accum[1] * 2) + accum[0];
    }

    codeword[0] = (y_reg[10] * 1024) + (y_reg[9] * 512) + (y_reg[8] * 256) +
            (y_reg[7] * 128) + (y_reg[6] * 64) + (y_reg[5] * 32) +
            (y_reg[4] * 16) + (y_reg[3] * 8) + (y_reg[2] * 4) +
            (y_reg[1] * 2) + y_reg[0];

    for (i = 0; i < 8; i++) {
        if (codeword[i] == 1365) {
            codeword[i] = 0;
            codeword[i + 1]++;
        }
    }

    /* *** Step 4 - Inserting Additional Information into Codewords *** */

    codeword[9] = codeword[9] * 2;

    if (usps_crc >= 1024) {
        codeword[0] += 659;
    }

    /* *** Step 5 - Conversion from Codewords to Characters *** */

    for (i = 0; i < 10; i++) {
        if (codeword[i] < 1287) {
            characters[i] = AppxD_I[codeword[i]];
        } else {
            characters[i] = AppxD_II[codeword[i] - 1287];
        }
    }
    
    for (i = 0; i < 10; i++) {
        if (usps_crc & (1 << i)) {
            characters[i] = 0x1FFF - characters[i];
        }
    }

    /* *** Step 6 - Conversion from Characters to the Intelligent Mail Barcode *** */
    for (i = 0; i < 10; i++) {
        for (j = 0; j < 13; j++) {
            if (characters[i] & (1 << j)) {
                bar_map[AppxD_IV[(13 * i) + j] - 1] = 1;
            } else {
                bar_map[AppxD_IV[(13 * i) + j] - 1] = 0;
            }
        }
    }

    strcpy(data_pattern, "");
    temp[1] = '\0';
    for (i = 0; i < 65; i++) {
        j = 0;
        if (bar_map[i] == 0)
            j += 1;
        if (bar_map[i + 65] == 0)
            j += 2;
        temp[0] = itoc(j);
        strcat(data_pattern, temp);
    }

    /* Translate 4-state data pattern to symbol */
    read = 0;
    for (i = 0; i < strlen(data_pattern); i++) {
        if ((data_pattern[i] == '1') || (data_pattern[i] == '0')) {
            set_module(symbol, 0, read);
        }
        set_module(symbol, 1, read);
        if ((data_pattern[i] == '2') || (data_pattern[i] == '0')) {
            set_module(symbol, 2, read);
        }
        read += 2;
    }

    symbol->row_height[0] = 3;
    symbol->row_height[1] = 2;
    symbol->row_height[2] = 3;

    symbol->rows = 3;
    symbol->width = read - 1;
    return error_number;
}
